Process of distilling materials



March 18 1924.-

M.'L. GRIFFIN' PROCESS 0F DISTILLING MATERIALS l Filed March 26 1920 K la/clam qqu/afar Patented Mar. 18, 1924.

PATENT ortica ILARTIN L. GRIFFIN, OF BUMFORD, MAINE.

PROCESS F DISTILLING MATERIALS.

Application led March 26, 1920. Serial No. 368,884.

To allv whom t may concern:

Be it known that I, MAn'rlN L. GRIFFIN, a citizen of the United States, residin at Rumford, in the county of Oxford and tate of Maine, have invented a certain new and useful Improvement in Processes of Distilling Materials, of which the following is a specification. l

My invention relates particularly to a. process of treating waste materials so as to obtain valuable products therefrom notwithstanding the diiiculty of handling the same.

The object of my invention is to provide a process b means of which materials, which have a ten ency to foam and which are therefore dilicult to treat by ordinary processes of destructive distillation, may be subjected to destructive distillation so as to recover valuable by-products without the foaming tendency in any Way interfering with the process. A further object is particularly to treat in this way wood pulp waste liquors, as for example those obtained from the manufacture of sulphite pulp or soda. pulp, one kind of which is the so-called black liquor, although it is to be understood that the process is applicable also to waste liquors obtained from the treatment of other natural organic growths such as esparto grass, ordinary straw, cotton straw, stalks of plants, grasses, barks, etc. The object is furthermore to recover 'as by-products for example, acetone, methyl alcohol, oily materials, sodium ace tate and tarry substances. -o

Again the object is to carry out the rocess in such a way as to feed the materia to be distilled upon a moving surface where the material is completely treated to recover the products of the distillation without the necessity of moving. the material relative to the supporting surface during the treatment,

thus avoiding the formation of agglomerated masses which wouldtend to clog the apparatus.

The object is furthermore to decrease the cost of paper manufacture by recovering these by-products. v

Still another Objectis to obtain such byproducts continuously and without the necessity of addin porous materials thereto.

Further ob]ectsofmy invention will appear trom 4the detailed description thereof contained hereinafter.

While my invention is capable of embodishaft 10 to supp y the interior of the drum ment in many different forms, for the purpose of illustration I shall describe only one form of my invention hereinafter and while it is capable of being carried out in connection with many different types of apparatus,

I have shown only one type of apparatus for use in connection therewith in the accompan ing drawin in which- The ti, gs

.ency as (possible. From this point the concentrate liquor passes by a valved pipe 2 into a storage receptacle 3 having a manhole 4 and a valvedoutlet pipe 5. The ipe 7 5 conducts the liquor to a spray pipe 6 w ich sprays the same along the upper surface of a revolving drum 7 in a distilling chamber or retort 8 having hollow bearings 9 and 10 in its ends to receive ahollow shaft 10 on 30 which the drum 7 is carried. A ulley 1l is provided to drive the drum 7 rom any suitable source of power and stationary inlet and outlet ipes 12 and 13 enter the sa 7 with a heating medium. as for'example heated oil which may have a temperature such as to maintain the surface of the drum at. from 550 to 700 F. The drum 7 is rotated slowly andl the liquor is received thereon in a thin film. Immediately upon being received by the surface ofthe drum 7 thevolatile constituents of the mixture are expelled from the liquor and the carbonization proceeds very rapidly until the carbonization is complete and the dried and carbonized residue carried by the surface of the drum 7 is continually scraped oil by a scraper 14 and may be removed from the bottom of the chamber 8 through a door 15 whenever .10@ desired. The vapors which are formed b the carbonization of the liquor and whic are comprised of steam, acetone, methyl alcohol, etc., pass awa by a pi e 16 to a tubular condenser 1 provid with a cooling current of water by means of inlet and outlet pipes 18 and 19 and from which the condensate is conducted by a valved outlet pipe 2O to a condensate storage receptacle 2l having a man-hole 22 and a valved liquid outlet pipe 23. The uncondensed gases escape from the condensate storage receptacle 21 by means of a valved pipe 24.

While I have described my invention above in detail I wish it to be understood that many changes may be made therein Without departing from the spirit thereof.

I claim:

1. The process of distilling a Wood pulp waste liquor which consists in evaporating it on the surface of an internally heated, rotary drum in order to distill oil the volatile matter, and then condensing said volatile matter. 15

2. The process of distilling a wood pulp Waste liquor Which consists in evaporating it on the surface of an internally heated rota drum, condensing the volatile matter evolve and substantially continuously scraping from 20 thev drum the dry residue.

In testimony that I claim the foregoing, I have hereunto set my hand this 20th day of March, 1920.

MARTIN L. GRIFFIN. 

